반응 #355087

반응 방정식

9-fluoro-11β ,17,21-trihydroxy-16α-[(2-methyl-oxiranyl)methoxy]pregn-4-ene-3,20-dione

periodic acid

→

9-fluoro-11β ,17,21-trihydroxy-16α-(2-oxopropoxy)pregn-4-ene-3,20-dione

수율 22.0%

용매

chloroform

water

tetrahydrofuran

water

반응 조건

후처리

1. 1
   추출extracted with chloroform
2. 2
   세척The chloroform solution is washed with 10% sodium bicarbonate solution
3. 3
   기타dried
4. 4
   기타evaporated in vacuo
5. 5
   기타to give an oily residue
6. 6
   기타chromatographed on a 40 g-silica gel column
7. 7
   세척Elution with chloroform
8. 8
   기타gives 400 mg of slightly impure product
9. 9
   기타The 990 mg is recrystallized twice from acetone-hexane

실험 절차

A solution of 1.54 g of 9-fluoro-11β ,17,21-trihydroxy-16α-[(2-methyl-oxiranyl)methoxy]pregn-4-ene-3,20-dione, 21-acetate in 50 ml of tetrahydrofuran is stirred for 270 minutes with a solution of 2.6 g of periodic acid in 20 ml of water. The solution is poured into water and extracted with chloroform. The chloroform solution is washed with 10% sodium bicarbonate solution, dried, and evaporated in vacuo to give an oily residue. This is dissolved in chloroform and chromatographed on a 40 g-silica gel column. Elution with chloroform gives 400 mg of slightly impure product followed by 990 mg of TLC homogeneous solid. The 990 mg is recrystallized twice from acetone-hexane to give 328 mg of 9-fluoro-11β ,17,21-trihydroxy-16α-(2-oxopropoxy)pregn-4-ene-3,20-dione, 21-acetate, melting point 203°-208°C.

출처